(client) feat:窗口新增独占、占用输入属性，添加部分行为树节点和工作类

Client/Assets/Scripts/UI/EntityPlacementUI.cs

@@ -0,0 +1,26 @@
+using Base;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace UI
+{
+    public class EntityPlacementUI:UIBase,ITickUI
+    {
+        public UnityAction currentAction = null;
+        public void TickUI()
+        {
+            if (!IsVisible||currentAction==null)
+                return;
+            if (Input.GetMouseButton(0))
+            {
+                currentAction.Invoke();
+            }
+
+            if (Input.GetKeyDown(KeyCode.Escape))
+            {
+                Hide();
+            }
+        }
+        
+    }
+}